/*
- * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
- *
- * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the
- * License may not be used to create, or enable the creation or
- * redistribution of, unlawful or unlicensed copies of an Apple operating
- * system, or to circumvent, violate, or enable the circumvention or
- * violation of, any terms of an Apple operating system software license
- * agreement.
+ * Copyright (c) 2004-2016 Apple Inc. All rights reserved.
*
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
*/
#include <sys/appleapiopts.h>
-#include <sys/param.h> /* XXX trim includes */
+#include <sys/param.h> /* XXX trim includes */
#include <sys/acct.h>
#include <sys/systm.h>
#include <sys/ucred.h>
#include <sys/kauth.h>
#include <sys/stat.h>
-#include <bsm/audit_kernel.h>
+#include <security/audit/audit.h>
#include <sys/mount.h>
#include <sys/sysproto.h>
lck_grp_t *kauth_lck_grp;
static lck_mtx_t *kauth_scope_mtx;
-#define KAUTH_SCOPELOCK() lck_mtx_lock(kauth_scope_mtx);
-#define KAUTH_SCOPEUNLOCK() lck_mtx_unlock(kauth_scope_mtx);
+#define KAUTH_SCOPELOCK() lck_mtx_lock(kauth_scope_mtx);
+#define KAUTH_SCOPEUNLOCK() lck_mtx_unlock(kauth_scope_mtx);
/*
* We support listeners for scopes that have not been registered yet.
* remove it from kauth_dangling_listeners and add it to the active scope.
*/
struct kauth_listener {
- TAILQ_ENTRY(kauth_listener) kl_link;
- const char * kl_identifier;
- kauth_scope_callback_t kl_callback;
- void * kl_idata;
+ TAILQ_ENTRY(kauth_listener) kl_link;
+ const char * kl_identifier;
+ kauth_scope_callback_t kl_callback;
+ void * kl_idata;
};
/* XXX - kauth_todo - there is a race if a scope listener is removed while we
* we are in the kauth_authorize_action code path. We intentionally do not take
- * a scope lock in order to get the best possible performance. we will fix this
- * post Tiger.
- * Until the race is fixed our kext clients are responsible for all active
+ * a scope lock in order to get the best possible performance. we will fix this
+ * post Tiger.
+ * Until the race is fixed our kext clients are responsible for all active
* requests that may be in their callback code or on the way to their callback
* code before they free kauth_listener.kl_callback or kauth_listener.kl_idata.
- * We keep copies of these in our kauth_local_listener in an attempt to limit
- * our expose to unlisten race.
+ * We keep copies of these in our kauth_local_listener in an attempt to limit
+ * our expose to unlisten race.
*/
struct kauth_local_listener {
- kauth_listener_t kll_listenerp;
- kauth_scope_callback_t kll_callback;
- void * kll_idata;
+ kauth_listener_t kll_listenerp;
+ kauth_scope_callback_t kll_callback;
+ void * kll_idata;
};
typedef struct kauth_local_listener *kauth_local_listener_t;
-static TAILQ_HEAD(,kauth_listener) kauth_dangling_listeners;
+static TAILQ_HEAD(, kauth_listener) kauth_dangling_listeners;
-/*
+/*
* Scope listeners need to be reworked to be dynamic.
- * We intentionally used a static table to avoid locking issues with linked
+ * We intentionally used a static table to avoid locking issues with linked
* lists. The listeners may be called quite often.
* XXX - kauth_todo
*/
#define KAUTH_SCOPE_MAX_LISTENERS 15
struct kauth_scope {
- TAILQ_ENTRY(kauth_scope) ks_link;
+ TAILQ_ENTRY(kauth_scope) ks_link;
volatile struct kauth_local_listener ks_listeners[KAUTH_SCOPE_MAX_LISTENERS];
- const char * ks_identifier;
- kauth_scope_callback_t ks_callback;
- void * ks_idata;
- u_int ks_flags;
+ const char * ks_identifier;
+ kauth_scope_callback_t ks_callback;
+ void * ks_idata;
+ u_int ks_flags;
};
/* values for kauth_scope.ks_flags */
-#define KS_F_HAS_LISTENERS (1 << 0)
+#define KS_F_HAS_LISTENERS (1 << 0)
-static TAILQ_HEAD(,kauth_scope) kauth_scopes;
+static TAILQ_HEAD(, kauth_scope) kauth_scopes;
static int kauth_add_callback_to_scope(kauth_scope_t sp, kauth_listener_t klp);
-static void kauth_scope_init(void);
+static void kauth_scope_init(void);
static kauth_scope_t kauth_alloc_scope(const char *identifier, kauth_scope_callback_t callback, void *idata);
static kauth_listener_t kauth_alloc_listener(const char *identifier, kauth_scope_callback_t callback, void *idata);
#if 0
-static int kauth_scope_valid(kauth_scope_t scope);
+static int kauth_scope_valid(kauth_scope_t scope);
#endif
-kauth_scope_t kauth_scope_process;
-static int kauth_authorize_process_callback(kauth_cred_t _credential, void *_idata, kauth_action_t _action,
+kauth_scope_t kauth_scope_process;
+static int kauth_authorize_process_callback(kauth_cred_t _credential, void *_idata, kauth_action_t _action,
uintptr_t arg0, uintptr_t arg1, __unused uintptr_t arg2, __unused uintptr_t arg3);
-kauth_scope_t kauth_scope_generic;
-static int kauth_authorize_generic_callback(kauth_cred_t _credential, void *_idata, kauth_action_t _action,
+kauth_scope_t kauth_scope_generic;
+static int kauth_authorize_generic_callback(kauth_cred_t _credential, void *_idata, kauth_action_t _action,
uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3);
-kauth_scope_t kauth_scope_fileop;
+kauth_scope_t kauth_scope_fileop;
-extern int cansignal(struct proc *, kauth_cred_t, struct proc *, int);
-extern char * get_pathbuff(void);
-extern void release_pathbuff(char *path);
+extern int cansignal(struct proc *, kauth_cred_t, struct proc *, int);
+extern char * get_pathbuff(void);
+extern void release_pathbuff(char *path);
/*
* Initialization.
void
kauth_init(void)
{
- lck_grp_attr_t *grp_attributes;
+ lck_grp_attr_t *grp_attributes;
TAILQ_INIT(&kauth_scopes);
TAILQ_INIT(&kauth_dangling_listeners);
/* bring up kauth subsystem components */
kauth_cred_init();
+#if CONFIG_EXT_RESOLVER
kauth_identity_init();
kauth_groups_init();
+#endif
kauth_scope_init();
+#if CONFIG_EXT_RESOLVER
kauth_resolver_init();
-
+#endif
/* can't alloc locks after this */
lck_grp_free(kauth_lck_grp);
kauth_lck_grp = NULL;
static kauth_scope_t
kauth_alloc_scope(const char *identifier, kauth_scope_callback_t callback, void *idata)
{
- kauth_scope_t sp;
+ kauth_scope_t sp;
/*
* Allocate and populate the scope structure.
*/
- MALLOC(sp, kauth_scope_t, sizeof(*sp), M_KAUTH, M_WAITOK);
- if (sp == NULL)
- return(NULL);
- bzero(&sp->ks_listeners, sizeof(sp->ks_listeners));
+ MALLOC(sp, kauth_scope_t, sizeof(*sp), M_KAUTH, M_WAITOK | M_ZERO);
+ if (sp == NULL) {
+ return NULL;
+ }
sp->ks_flags = 0;
sp->ks_identifier = identifier;
sp->ks_idata = idata;
sp->ks_callback = callback;
- return(sp);
+ return sp;
}
static kauth_listener_t
* Allocate and populate the listener structure.
*/
MALLOC(lsp, kauth_listener_t, sizeof(*lsp), M_KAUTH, M_WAITOK);
- if (lsp == NULL)
- return(NULL);
+ if (lsp == NULL) {
+ return NULL;
+ }
lsp->kl_identifier = identifier;
lsp->kl_idata = idata;
lsp->kl_callback = callback;
- return(lsp);
+ return lsp;
}
kauth_scope_t
kauth_register_scope(const char *identifier, kauth_scope_callback_t callback, void *idata)
{
- kauth_scope_t sp, tsp;
- kauth_listener_t klp;
+ kauth_scope_t sp, tsp;
+ kauth_listener_t klp;
- if ((sp = kauth_alloc_scope(identifier, callback, idata)) == NULL)
- return(NULL);
+ if ((sp = kauth_alloc_scope(identifier, callback, idata)) == NULL) {
+ return NULL;
+ }
/*
* Lock the list and insert.
KAUTH_SCOPELOCK();
TAILQ_FOREACH(tsp, &kauth_scopes, ks_link) {
/* duplicate! */
- if (strcmp(tsp->ks_identifier, identifier) == 0) {
+ if (strncmp(tsp->ks_identifier, identifier,
+ strlen(tsp->ks_identifier) + 1) == 0) {
KAUTH_SCOPEUNLOCK();
FREE(sp, M_KAUTH);
- return(NULL);
+ return NULL;
}
}
TAILQ_INSERT_TAIL(&kauth_scopes, sp, ks_link);
*/
restart:
TAILQ_FOREACH(klp, &kauth_dangling_listeners, kl_link) {
- if (strcmp(klp->kl_identifier, sp->ks_identifier) == 0) {
+ if (strncmp(klp->kl_identifier, sp->ks_identifier,
+ strlen(klp->kl_identifier) + 1) == 0) {
/* found a match on the dangling listener list. add it to the
* the active scope.
*/
if (kauth_add_callback_to_scope(sp, klp) == 0) {
TAILQ_REMOVE(&kauth_dangling_listeners, klp, kl_link);
- }
- else {
+ } else {
#if 0
printf("%s - failed to add listener to scope \"%s\" \n", __FUNCTION__, sp->ks_identifier);
#endif
}
KAUTH_SCOPEUNLOCK();
- return(sp);
+ return sp;
}
void
kauth_deregister_scope(kauth_scope_t scope)
{
- int i;
+ int i;
KAUTH_SCOPELOCK();
TAILQ_REMOVE(&kauth_scopes, scope, ks_link);
-
+
/* relocate listeners back to the waiting list */
for (i = 0; i < KAUTH_SCOPE_MAX_LISTENERS; i++) {
if (scope->ks_listeners[i].kll_listenerp != NULL) {
TAILQ_INSERT_TAIL(&kauth_dangling_listeners, scope->ks_listeners[i].kll_listenerp, kl_link);
scope->ks_listeners[i].kll_listenerp = NULL;
- /*
+ /*
* XXX - kauth_todo - WARNING, do not clear kll_callback or
* kll_idata here. they are part of our scope unlisten race hack
*/
}
KAUTH_SCOPEUNLOCK();
FREE(scope, M_KAUTH);
-
+
return;
}
kauth_listen_scope(const char *identifier, kauth_scope_callback_t callback, void *idata)
{
kauth_listener_t klp;
- kauth_scope_t sp;
+ kauth_scope_t sp;
- if ((klp = kauth_alloc_listener(identifier, callback, idata)) == NULL)
- return(NULL);
+ if ((klp = kauth_alloc_listener(identifier, callback, idata)) == NULL) {
+ return NULL;
+ }
/*
* Lock the scope list and check to see whether this scope already exists.
*/
KAUTH_SCOPELOCK();
TAILQ_FOREACH(sp, &kauth_scopes, ks_link) {
- if (strcmp(sp->ks_identifier, identifier) == 0) {
+ if (strncmp(sp->ks_identifier, identifier,
+ strlen(sp->ks_identifier) + 1) == 0) {
/* scope exists, add it to scope listener table */
if (kauth_add_callback_to_scope(sp, klp) == 0) {
KAUTH_SCOPEUNLOCK();
- return(klp);
+ return klp;
}
/* table already full */
KAUTH_SCOPEUNLOCK();
FREE(klp, M_KAUTH);
- return(NULL);
+ return NULL;
}
}
-
+
/* scope doesn't exist, put on waiting list. */
TAILQ_INSERT_TAIL(&kauth_dangling_listeners, klp, kl_link);
KAUTH_SCOPEUNLOCK();
- return(klp);
+ return klp;
}
void
kauth_unlisten_scope(kauth_listener_t listener)
{
- kauth_scope_t sp;
- kauth_listener_t klp;
- int i, listener_count, do_free;
-
+ kauth_scope_t sp;
+ kauth_listener_t klp;
+ int i, listener_count, do_free;
+
KAUTH_SCOPELOCK();
/* search the active scope for this listener */
if (sp->ks_listeners[i].kll_listenerp == listener) {
sp->ks_listeners[i].kll_listenerp = NULL;
do_free = 1;
- /*
+ /*
* XXX - kauth_todo - WARNING, do not clear kll_callback or
* kll_idata here. they are part of our scope unlisten race hack
*/
- }
- else if (sp->ks_listeners[i].kll_listenerp != NULL) {
+ } else if (sp->ks_listeners[i].kll_listenerp != NULL) {
listener_count++;
}
}
/*
* Authorization requests.
+ *
+ * Returns: 0 Success
+ * EPERM Operation not permitted
+ *
+ * Imputed: *arg3, modified Callback return - depends on callback
+ * modification of *arg3, if any
*/
int
kauth_authorize_action(kauth_scope_t scope, kauth_cred_t credential, kauth_action_t action,
int result, ret, i;
/* ask the scope */
- if (scope->ks_callback != NULL)
+ if (scope->ks_callback != NULL) {
result = scope->ks_callback(credential, scope->ks_idata, action, arg0, arg1, arg2, arg3);
- else
+ } else {
result = KAUTH_RESULT_DEFER;
+ }
/* check with listeners */
if ((scope->ks_flags & KS_F_HAS_LISTENERS) != 0) {
for (i = 0; i < KAUTH_SCOPE_MAX_LISTENERS; i++) {
- /* XXX - kauth_todo - there is a race here if listener is removed - we will fix this post Tiger.
+ /* XXX - kauth_todo - there is a race here if listener is removed - we will fix this post Tiger.
* Until the race is fixed our kext clients are responsible for all active requests that may
* be in their callbacks or on the way to their callbacks before they free kl_callback or kl_idata.
- * We keep copies of these in our kauth_local_listener in an attempt to limit our expose to
- * unlisten race.
+ * We keep copies of these in our kauth_local_listener in an attempt to limit our expose to
+ * unlisten race.
*/
- if (scope->ks_listeners[i].kll_listenerp == NULL ||
- scope->ks_listeners[i].kll_callback == NULL)
+ if (scope->ks_listeners[i].kll_listenerp == NULL ||
+ scope->ks_listeners[i].kll_callback == NULL) {
continue;
+ }
ret = scope->ks_listeners[i].kll_callback(
- credential, scope->ks_listeners[i].kll_idata,
- action, arg0, arg1, arg2, arg3);
+ credential, scope->ks_listeners[i].kll_idata,
+ action, arg0, arg1, arg2, arg3);
if ((ret == KAUTH_RESULT_DENY) ||
- (result == KAUTH_RESULT_DEFER))
+ (result == KAUTH_RESULT_DEFER)) {
result = ret;
+ }
}
}
/* we need an explicit allow, or the auth fails */
- /* XXX need a mechanism for auth failure to be signalled vs. denial */
- return(result == KAUTH_RESULT_ALLOW ? 0 : EPERM);
+ /* XXX need a mechanism for auth failure to be signalled vs. denial */
+ return result == KAUTH_RESULT_ALLOW ? 0 : EPERM;
}
/*
*/
int
kauth_authorize_allow(__unused kauth_cred_t credential, __unused void *idata, __unused kauth_action_t action,
- __unused uintptr_t arg0, __unused uintptr_t arg1, __unused uintptr_t arg2, __unused uintptr_t arg3)
+ __unused uintptr_t arg0, __unused uintptr_t arg1, __unused uintptr_t arg2, __unused uintptr_t arg3)
{
-
- return(KAUTH_RESULT_ALLOW);
+ return KAUTH_RESULT_ALLOW;
}
#if 0
static int
kauth_scope_valid(kauth_scope_t scope)
{
- kauth_scope_t sp;
+ kauth_scope_t sp;
KAUTH_SCOPELOCK();
TAILQ_FOREACH(sp, &kauth_scopes, ks_link) {
- if (sp == scope)
+ if (sp == scope) {
break;
+ }
}
KAUTH_SCOPEUNLOCK();
- return((sp == NULL) ? 0 : 1);
+ return (sp == NULL) ? 0 : 1;
}
#endif
int
kauth_authorize_process(kauth_cred_t credential, kauth_action_t action, struct proc *process, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3)
{
- return(kauth_authorize_action(kauth_scope_process, credential, action, (uintptr_t)process, arg1, arg2, arg3));
+ return kauth_authorize_action(kauth_scope_process, credential, action, (uintptr_t)process, arg1, arg2, arg3);
}
static int
kauth_authorize_process_callback(kauth_cred_t credential, __unused void *idata, kauth_action_t action,
uintptr_t arg0, uintptr_t arg1, __unused uintptr_t arg2, __unused uintptr_t arg3)
{
- switch(action) {
+ switch (action) {
case KAUTH_PROCESS_CANSIGNAL:
panic("KAUTH_PROCESS_CANSIGNAL not implemented");
/* XXX credential wrong here */
/* arg0 - process to signal
* arg1 - signal to send the process
*/
- if (cansignal(current_proc(), credential, (struct proc *)arg0, (int)arg1))
- return(KAUTH_RESULT_ALLOW);
+ if (cansignal(current_proc(), credential, (struct proc *)arg0, (int)arg1)) {
+ return KAUTH_RESULT_ALLOW;
+ }
break;
case KAUTH_PROCESS_CANTRACE:
- /* current_proc() - process that will do the tracing
- * arg0 - process to be traced
- * arg1 - pointer to int - reason (errno) for denial
+ /* current_proc() - process that will do the tracing
+ * arg0 - process to be traced
+ * arg1 - pointer to int - reason (errno) for denial
*/
- if (cantrace(current_proc(), credential, (proc_t)arg0, (int *)arg1))
- return(KAUTH_RESULT_ALLOW);
+ if (cantrace(current_proc(), credential, (proc_t)arg0, (int *)arg1)) {
+ return KAUTH_RESULT_ALLOW;
+ }
break;
}
/* no explicit result, so defer to others in the chain */
- return(KAUTH_RESULT_DEFER);
+ return KAUTH_RESULT_DEFER;
}
/*
* arg0 is pointer to vnode (vnode *) for file to be closed.
* arg1 is pointer to path (char *) of file to be closed.
* arg2 is close flags.
+ * arguments passed to KAUTH_FILEOP_WILL_RENAME listeners
+ * arg0 is pointer to vnode (vnode *) of the file being renamed
+ * arg1 is pointer to the "from" path (char *)
+ * arg2 is pointer to the "to" path (char *)
* arguments passed to KAUTH_FILEOP_RENAME listeners
* arg0 is pointer to "from" path (char *).
* arg1 is pointer to "to" path (char *).
* otherwize return 0
*/
if ((kauth_scope_fileop->ks_flags & KS_F_HAS_LISTENERS) != 0) {
- return(1);
+ return 1;
}
- return (0);
+ return 0;
}
int
kauth_authorize_fileop(kauth_cred_t credential, kauth_action_t action, uintptr_t arg0, uintptr_t arg1)
{
- char *namep = NULL;
- int name_len;
- uintptr_t arg2 = 0;
-
- /* we do not have a primary handler for the fileop scope so bail out if
+ char *namep = NULL;
+ int name_len;
+ uintptr_t arg2 = 0;
+
+ /* we do not have a primary handler for the fileop scope so bail out if
* there are no listeners.
*/
if ((kauth_scope_fileop->ks_flags & KS_F_HAS_LISTENERS) == 0) {
- return(0);
+ return 0;
}
- if (action == KAUTH_FILEOP_OPEN || action == KAUTH_FILEOP_CLOSE || action == KAUTH_FILEOP_EXEC) {
+ if (action == KAUTH_FILEOP_OPEN ||
+ action == KAUTH_FILEOP_CLOSE ||
+ action == KAUTH_FILEOP_EXEC ||
+ action == KAUTH_FILEOP_WILL_RENAME) {
/* get path to the given vnode as a convenience to our listeners.
*/
namep = get_pathbuff();
name_len = MAXPATHLEN;
if (vn_getpath((vnode_t)arg0, namep, &name_len) != 0) {
release_pathbuff(namep);
- return(0);
+ return 0;
}
- if (action == KAUTH_FILEOP_CLOSE) {
- arg2 = arg1; /* close has some flags that come in via arg1 */
+ if (action == KAUTH_FILEOP_CLOSE ||
+ action == KAUTH_FILEOP_WILL_RENAME) {
+ /*
+ * - Close has some flags that come in via arg1.
+ * - Will-rename wants to pass the vnode and
+ * both paths to the listeners ("to" path
+ * starts in arg1, moves to arg2).
+ */
+ arg2 = arg1;
}
arg1 = (uintptr_t)namep;
- }
+ }
kauth_authorize_action(kauth_scope_fileop, credential, action, arg0, arg1, arg2, 0);
-
+
if (namep != NULL) {
release_pathbuff(namep);
}
-
- return(0);
+
+ return 0;
}
/*
int
kauth_authorize_generic(kauth_cred_t credential, kauth_action_t action)
{
- if (credential == NULL)
+ if (credential == NULL) {
panic("auth against NULL credential");
+ }
- return(kauth_authorize_action(kauth_scope_generic, credential, action, 0, 0, 0, 0));
-
+ return kauth_authorize_action(kauth_scope_generic, credential, action, 0, 0, 0, 0);
}
static int
kauth_authorize_generic_callback(kauth_cred_t credential, __unused void *idata, kauth_action_t action,
- __unused uintptr_t arg0, __unused uintptr_t arg1, __unused uintptr_t arg2, __unused uintptr_t arg3)
+ __unused uintptr_t arg0, __unused uintptr_t arg1, __unused uintptr_t arg2, __unused uintptr_t arg3)
{
- switch(action) {
+ switch (action) {
case KAUTH_GENERIC_ISSUSER:
/* XXX == 0 ? */
- return((kauth_cred_getuid(credential) == 0) ?
- KAUTH_RESULT_ALLOW : KAUTH_RESULT_DENY);
- break;
+ return (kauth_cred_getuid(credential) == 0) ?
+ KAUTH_RESULT_ALLOW : KAUTH_RESULT_DENY;
}
/* no explicit result, so defer to others in the chain */
- return(KAUTH_RESULT_DEFER);
+ return KAUTH_RESULT_DEFER;
}
/*
int
kauth_acl_evaluate(kauth_cred_t cred, kauth_acl_eval_t eval)
{
- int applies, error, i;
+ int applies, error, i, gotguid;
kauth_ace_t ace;
guid_t guid;
uint32_t rights;
/* always allowed to do nothing */
if (eval->ae_requested == 0) {
eval->ae_result = KAUTH_RESULT_ALLOW;
- return(0);
+ return 0;
}
eval->ae_residual = eval->ae_requested;
+ eval->ae_found_deny = FALSE;
/*
* Get our guid for comparison purposes.
*/
if ((error = kauth_cred_getguid(cred, &guid)) != 0) {
- eval->ae_result = KAUTH_RESULT_DENY;
- KAUTH_DEBUG(" ACL - can't get credential GUID (%d), ACL denied", error);
- return(error);
+ KAUTH_DEBUG(" ACL - can't get credential GUID (%d)", error);
+ error = 0;
+ gotguid = 0;
+ } else {
+ gotguid = 1;
}
KAUTH_DEBUG(" ACL - %d entries, initial residual %x", eval->ae_count, eval->ae_residual);
for (i = 0, ace = eval->ae_acl; i < eval->ae_count; i++, ace++) {
-
/*
* Skip inherit-only entries.
*/
- if (ace->ace_flags & KAUTH_ACE_ONLY_INHERIT)
+ if (ace->ace_flags & KAUTH_ACE_ONLY_INHERIT) {
continue;
+ }
/*
* Expand generic rights, if appropriate.
*/
rights = ace->ace_rights;
- if (rights & KAUTH_ACE_GENERIC_ALL)
+ if (rights & KAUTH_ACE_GENERIC_ALL) {
rights |= eval->ae_exp_gall;
- if (rights & KAUTH_ACE_GENERIC_READ)
+ }
+ if (rights & KAUTH_ACE_GENERIC_READ) {
rights |= eval->ae_exp_gread;
- if (rights & KAUTH_ACE_GENERIC_WRITE)
+ }
+ if (rights & KAUTH_ACE_GENERIC_WRITE) {
rights |= eval->ae_exp_gwrite;
- if (rights & KAUTH_ACE_GENERIC_EXECUTE)
+ }
+ if (rights & KAUTH_ACE_GENERIC_EXECUTE) {
rights |= eval->ae_exp_gexec;
+ }
/*
* Determine whether this entry applies to the current request. This
* saves us checking the GUID if the entry has nothing to do with what
* we're currently doing.
*/
- switch(ace->ace_flags & KAUTH_ACE_KINDMASK) {
+ switch (ace->ace_flags & KAUTH_ACE_KINDMASK) {
case KAUTH_ACE_PERMIT:
- if (!(eval->ae_residual & rights))
+ if (!(eval->ae_residual & rights)) {
continue;
+ }
break;
case KAUTH_ACE_DENY:
- if (!(eval->ae_requested & rights))
+ if (!(eval->ae_requested & rights)) {
continue;
+ }
+ eval->ae_found_deny = TRUE;
break;
default:
/* we don't recognise this ACE, skip it */
continue;
}
-
+
/*
* Verify whether this entry applies to the credential.
*/
wkguid = kauth_wellknown_guid(&ace->ace_applicable);
- switch(wkguid) {
+ switch (wkguid) {
case KAUTH_WKG_OWNER:
applies = eval->ae_options & KAUTH_AEVAL_IS_OWNER;
break;
case KAUTH_WKG_GROUP:
- applies = eval->ae_options & KAUTH_AEVAL_IN_GROUP;
+ if (!gotguid || (eval->ae_options & KAUTH_AEVAL_IN_GROUP_UNKNOWN)) {
+ applies = ((ace->ace_flags & KAUTH_ACE_KINDMASK) == KAUTH_ACE_DENY);
+ } else {
+ applies = eval->ae_options & KAUTH_AEVAL_IN_GROUP;
+ }
break;
/* we short-circuit these here rather than wasting time calling the group membership code */
case KAUTH_WKG_EVERYBODY:
default:
/* check to see whether it's exactly us, or a group we are a member of */
- applies = kauth_guid_equal(&guid, &ace->ace_applicable);
+ applies = !gotguid ? 0 : kauth_guid_equal(&guid, &ace->ace_applicable);
KAUTH_DEBUG(" ACL - ACE applicable " K_UUID_FMT " caller " K_UUID_FMT " %smatched",
K_UUID_ARG(ace->ace_applicable), K_UUID_ARG(guid), applies ? "" : "not ");
-
+
if (!applies) {
- error = kauth_cred_ismember_guid(cred, &ace->ace_applicable, &applies);
+ error = !gotguid ? ENOENT : kauth_cred_ismember_guid(cred, &ace->ace_applicable, &applies);
/*
* If we can't resolve group membership, we have to limit misbehaviour.
* If the ACE is an 'allow' ACE, assume the cred is not a member (avoid
*/
if (error != 0) {
KAUTH_DEBUG(" ACL[%d] - can't get membership, making pessimistic assumption", i);
- switch(ace->ace_flags & KAUTH_ACE_KINDMASK) {
+ switch (ace->ace_flags & KAUTH_ACE_KINDMASK) {
case KAUTH_ACE_PERMIT:
applies = 0;
break;
KAUTH_DEBUG(" ACL - entry matches caller");
}
}
- if (!applies)
+ if (!applies) {
continue;
+ }
/*
* Apply ACE to outstanding rights.
*/
- switch(ace->ace_flags & KAUTH_ACE_KINDMASK) {
+ switch (ace->ace_flags & KAUTH_ACE_KINDMASK) {
case KAUTH_ACE_PERMIT:
/* satisfy any rights that this ACE grants */
eval->ae_residual = eval->ae_residual & ~rights;
/* all rights satisfied? */
if (eval->ae_residual == 0) {
eval->ae_result = KAUTH_RESULT_ALLOW;
- return(0);
+ return 0;
}
break;
case KAUTH_ACE_DENY:
if (eval->ae_requested & rights) {
KAUTH_DEBUG(" ACL[%d] - denying based on %x", i, rights);
eval->ae_result = KAUTH_RESULT_DENY;
- return(0);
+ return 0;
}
break;
default:
}
/* if not permitted, defer to other modes of authorisation */
eval->ae_result = KAUTH_RESULT_DEFER;
- return(0);
+ return 0;
}
/*
int
kauth_acl_inherit(vnode_t dvp, kauth_acl_t initial, kauth_acl_t *product, int isdir, vfs_context_t ctx)
{
- int entries, error, index;
+ int entries, error, index;
unsigned int i;
struct vnode_attr dva;
kauth_acl_t inherit, result;
/*
- * Fetch the ACL from the directory. This should never fail. Note that we don't
- * manage inheritance when the remote server is doing authorization; we just
- * want to compose the umask-ACL and any initial ACL.
+ * Fetch the ACL from the directory. This should never fail.
+ * Note that we don't manage inheritance when the remote server is
+ * doing authorization, since this means server enforcement of
+ * inheritance semantics; we just want to compose the initial
+ * ACL and any inherited ACE entries from the container object.
+ *
+ * XXX TODO: <rdar://3634665> wants a "umask ACL" from the process.
*/
inherit = NULL;
- if ((dvp != NULL) && !vfs_authopaque(vnode_mount(dvp))) {
+ /*
+ * If there is no initial ACL, or there is, and the initial ACLs
+ * flags do not request "no inheritance", then we inherit. This allows
+ * initial object creation via open_extended() and mkdir_extended()
+ * to reject inheritance for themselves and for inferior nodes by
+ * specifying a non-NULL inital ACL which has the KAUTH_ACL_NO_INHERIT
+ * flag set in the flags field.
+ */
+ if ((initial == NULL || !(initial->acl_flags & KAUTH_ACL_NO_INHERIT)) &&
+ (dvp != NULL) && !vfs_authopaque(vnode_mount(dvp))) {
VATTR_INIT(&dva);
VATTR_WANTED(&dva, va_acl);
if ((error = vnode_getattr(dvp, &dva, ctx)) != 0) {
KAUTH_DEBUG(" ERROR - could not get parent directory ACL for inheritance");
- return(error);
+ return error;
}
- if (VATTR_IS_SUPPORTED(&dva, va_acl))
+ if (VATTR_IS_SUPPORTED(&dva, va_acl)) {
inherit = dva.va_acl;
+ }
}
/*
- * Compute the number of entries in the result ACL by scanning the input lists.
+ * Compute the number of entries in the result ACL by scanning the
+ * input lists.
*/
entries = 0;
if (inherit != NULL) {
for (i = 0; i < inherit->acl_entrycount; i++) {
- if (inherit->acl_ace[i].ace_flags & (isdir ? KAUTH_ACE_DIRECTORY_INHERIT : KAUTH_ACE_FILE_INHERIT))
+ if (inherit->acl_ace[i].ace_flags & (isdir ? KAUTH_ACE_DIRECTORY_INHERIT : KAUTH_ACE_FILE_INHERIT)) {
entries++;
+ }
}
}
if (initial == NULL) {
- /* XXX 3634665 TODO: fetch umask ACL from the process, set in initial */
+ /*
+ * XXX 3634665 TODO: if the initial ACL is not specfied by
+ * XXX the caller, fetch the umask ACL from the process,
+ * and use it in place of "initial".
+ */
}
if (initial != NULL) {
- entries += initial->acl_entrycount;
+ if (initial->acl_entrycount != KAUTH_FILESEC_NOACL) {
+ entries += initial->acl_entrycount;
+ } else {
+ initial = NULL;
+ }
}
/*
* If there is no initial ACL, and no inheritable entries, the
- * object should have no ACL at all.
+ * object should be created with no ACL at all.
* Note that this differs from the case where the initial ACL
* is empty, in which case the object must also have an empty ACL.
*/
error = 0;
goto out;
}
-
+
/*
* Allocate the result buffer.
*/
if ((result = kauth_acl_alloc(entries)) == NULL) {
- KAUTH_DEBUG(" ERROR - could not allocate %d-entry result buffer for inherited ACL");
+ KAUTH_DEBUG(" ERROR - could not allocate %d-entry result buffer for inherited ACL", entries);
error = ENOMEM;
goto out;
}
/*
* Composition is simply:
- * - initial
- * - inherited
+ * - initial direct ACEs
+ * - inherited ACEs from new parent
*/
index = 0;
if (initial != NULL) {
- for (i = 0; i < initial->acl_entrycount; i++)
- result->acl_ace[index++] = initial->acl_ace[i];
- KAUTH_DEBUG(" INHERIT - applied %d initial entries", index);
+ for (i = 0; i < initial->acl_entrycount; i++) {
+ if (!(initial->acl_ace[i].ace_flags & KAUTH_ACE_INHERITED)) {
+ result->acl_ace[index++] = initial->acl_ace[i];
+ }
+ }
+ KAUTH_DEBUG(" INHERIT - applied %d of %d initial entries", index, initial->acl_entrycount);
}
if (inherit != NULL) {
for (i = 0; i < inherit->acl_entrycount; i++) {
- /* inherit onto this object? */
+ /*
+ * Inherit onto this object? We inherit only if
+ * the target object is a container object and the
+ * KAUTH_ACE_DIRECTORY_INHERIT bit is set, OR if
+ * if the target object is not a container, and
+ * the KAUTH_ACE_FILE_INHERIT bit is set.
+ */
if (inherit->acl_ace[i].ace_flags & (isdir ? KAUTH_ACE_DIRECTORY_INHERIT : KAUTH_ACE_FILE_INHERIT)) {
result->acl_ace[index] = inherit->acl_ace[i];
result->acl_ace[index].ace_flags |= KAUTH_ACE_INHERITED;
- /* don't re-inherit? */
- if (result->acl_ace[index].ace_flags & KAUTH_ACE_LIMIT_INHERIT)
+ result->acl_ace[index].ace_flags &= ~KAUTH_ACE_ONLY_INHERIT;
+ /*
+ * We do not re-inherit inheritance flags
+ * if the ACE from the container has a
+ * KAUTH_ACE_LIMIT_INHERIT, OR if the new
+ * object is not itself a container (since
+ * inheritance is always container-based).
+ */
+ if ((result->acl_ace[index].ace_flags & KAUTH_ACE_LIMIT_INHERIT) || !isdir) {
result->acl_ace[index].ace_flags &=
- ~(KAUTH_ACE_DIRECTORY_INHERIT | KAUTH_ACE_FILE_INHERIT | KAUTH_ACE_LIMIT_INHERIT);
+ ~(KAUTH_ACE_INHERIT_CONTROL_FLAGS);
+ }
index++;
}
}
KAUTH_DEBUG(" INHERIT - product ACL has %d entries", index);
error = 0;
out:
- if (inherit != NULL)
+ if (inherit != NULL) {
kauth_acl_free(inherit);
- return(error);
+ }
+ return error;
}
/*
* Optimistically copy in a kauth_filesec structure
+ *
* Parameters: xsecurity user space kauth_filesec_t
- * xsecdstpp pointer to kauth_filesec_t
+ * xsecdstpp pointer to kauth_filesec_t to be
+ * modified to contain the contain a
+ * pointer to an allocated copy of the
+ * user space argument
+ *
+ * Returns: 0 Success
+ * ENOMEM Insufficient memory for the copy.
+ * EINVAL The user space data was invalid, or
+ * there were too many ACE entries.
+ * EFAULT The user space address was invalid;
+ * this may mean 'fsec_entrycount' in
+ * the user copy is corrupt/incorrect.
+ *
+ * Implicit returns: xsecdestpp, modified (only if successful!)
+ *
+ * Notes: The returned kauth_filesec_t is in host byte order
*
- * Returns: 0 on success, EINVAL or EFAULT depending on failure mode.
- * Modifies: xsecdestpp, which contains a pointer to an allocated
- * and copied-in kauth_filesec_t
+ * The caller is responsible for freeing the returned
+ * kauth_filesec_t in the success case using the function
+ * kauth_filesec_free()
+ *
+ * Our largest initial guess is 32; this needs to move to
+ * a manifest constant in <sys/kauth.h>.
*/
-
int
kauth_copyinfilesec(user_addr_t xsecurity, kauth_filesec_t *xsecdestpp)
{
- user_addr_t uaddr, known_bound;
int error;
kauth_filesec_t fsec;
u_int32_t count;
size_t copysize;
-
+
error = 0;
fsec = NULL;
*
* The upper bound must be less than KAUTH_ACL_MAX_ENTRIES. The
* value here is fairly arbitrary. It's ok to have a zero count.
+ *
+ * Because we're just using these values to make a guess about the
+ * number of entries, the actual address doesn't matter, only their
+ * relative offsets into the page. We take advantage of this to
+ * avoid an overflow in the rounding step (this is a user-provided
+ * parameter, so caution pays off).
*/
- known_bound = xsecurity + sizeof(struct kauth_filesec);
- uaddr = mach_vm_round_page(known_bound);
- count = (uaddr - known_bound) / sizeof(struct kauth_ace);
- if (count > 32)
+ {
+ user_addr_t known_bound = (xsecurity & PAGE_MASK) + KAUTH_FILESEC_SIZE(0);
+ user_addr_t uaddr = mach_vm_round_page(known_bound);
+ count = (uaddr - known_bound) / sizeof(struct kauth_ace);
+ }
+ if (count > 32) {
count = 32;
+ }
restart:
if ((fsec = kauth_filesec_alloc(count)) == NULL) {
error = ENOMEM;
goto out;
}
copysize = KAUTH_FILESEC_SIZE(count);
- if ((error = copyin(xsecurity, (caddr_t)fsec, copysize)) != 0)
+ if ((error = copyin(xsecurity, (caddr_t)fsec, copysize)) != 0) {
goto out;
+ }
/* validate the filesec header */
if (fsec->fsec_magic != KAUTH_FILESEC_MAGIC) {
if ((fsec->fsec_entrycount != KAUTH_FILESEC_NOACL) &&
(fsec->fsec_entrycount > count)) {
if (fsec->fsec_entrycount > KAUTH_ACL_MAX_ENTRIES) {
+ /* XXX This should be E2BIG */
error = EINVAL;
goto out;
}
kauth_filesec_free(fsec);
goto restart;
}
-
+
out:
if (error) {
- if (fsec)
+ if (fsec) {
kauth_filesec_free(fsec);
+ }
} else {
*xsecdestpp = fsec;
+ AUDIT_ARG(opaque, fsec, copysize);
}
- return(error);
+ return error;
}
/*
- * Allocate a filesec structure.
+ * Allocate a block of memory containing a filesec structure, immediately
+ * followed by 'count' kauth_ace structures.
+ *
+ * Parameters: count Number of kauth_ace structures needed
+ *
+ * Returns: !NULL A pointer to the allocated block
+ * NULL Invalid 'count' or insufficient memory
+ *
+ * Notes: Returned memory area assumes that the structures are packed
+ * densely, so this function may only be used by code that also
+ * assumes no padding following structures.
+ *
+ * The returned structure must be freed by the caller using the
+ * function kauth_filesec_free(), in case we decide to use an
+ * allocation mechanism that is aware of the object size at some
+ * point, since the object size is only available by introspecting
+ * the object itself.
*/
kauth_filesec_t
kauth_filesec_alloc(int count)
{
- kauth_filesec_t fsp;
-
+ kauth_filesec_t fsp;
+
/* if the caller hasn't given us a valid size hint, assume the worst */
- if ((count < 0) || (count > KAUTH_ACL_MAX_ENTRIES))
- return(NULL);
+ if ((count < 0) || (count > KAUTH_ACL_MAX_ENTRIES)) {
+ return NULL;
+ }
MALLOC(fsp, kauth_filesec_t, KAUTH_FILESEC_SIZE(count), M_KAUTH, M_WAITOK);
if (fsp != NULL) {
fsp->fsec_entrycount = KAUTH_FILESEC_NOACL;
fsp->fsec_flags = 0;
}
- return(fsp);
-}
+ return fsp;
+}
+/*
+ * Free a kauth_filesec_t that was previous allocated, either by a direct
+ * call to kauth_filesec_alloc() or by calling a function that calls it.
+ *
+ * Parameters: fsp kauth_filesec_t to free
+ *
+ * Returns: (void)
+ *
+ * Notes: The kauth_filesec_t to be freed is assumed to be in host
+ * byte order so that this function can introspect it in the
+ * future to determine its size, if necesssary.
+ */
void
kauth_filesec_free(kauth_filesec_t fsp)
{
#ifdef KAUTH_DEBUG_ENABLE
- if (fsp == KAUTH_FILESEC_NONE)
+ if (fsp == KAUTH_FILESEC_NONE) {
panic("freeing KAUTH_FILESEC_NONE");
- if (fsp == KAUTH_FILESEC_WANTED)
+ }
+ if (fsp == KAUTH_FILESEC_WANTED) {
panic("freeing KAUTH_FILESEC_WANTED");
+ }
#endif
FREE(fsp, M_KAUTH);
}
+/*
+ * Set the endianness of a filesec and an ACL; if 'acl' is NULL, use the
+ * ACL interior to 'fsec' instead. If the endianness doesn't change, then
+ * this function will have no effect.
+ *
+ * Parameters: kendian The endianness to set; this is either
+ * KAUTH_ENDIAN_HOST or KAUTH_ENDIAN_DISK.
+ * fsec The filesec to convert.
+ * acl The ACL to convert (optional)
+ *
+ * Returns: (void)
+ *
+ * Notes: We use ntohl() because it has a transitive property on Intel
+ * machines and no effect on PPC mancines. This guarantees us
+ * that the swapping only occurs if the endiannes is wrong.
+ */
+void
+kauth_filesec_acl_setendian(int kendian, kauth_filesec_t fsec, kauth_acl_t acl)
+{
+ uint32_t compare_magic = KAUTH_FILESEC_MAGIC;
+ uint32_t invert_magic = ntohl(KAUTH_FILESEC_MAGIC);
+ uint32_t compare_acl_entrycount;
+ uint32_t i;
+
+ if (compare_magic == invert_magic) {
+ return;
+ }
+
+ /* If no ACL, use ACL interior to 'fsec' instead */
+ if (acl == NULL) {
+ acl = &fsec->fsec_acl;
+ }
+
+ compare_acl_entrycount = acl->acl_entrycount;
+
+ /*
+ * Only convert what needs to be converted, and only if the arguments
+ * are valid. The following switch and tests effectively reject
+ * conversions on invalid magic numbers as a desirable side effect.
+ */
+ switch (kendian) {
+ case KAUTH_ENDIAN_HOST: /* not in host, convert to host */
+ if (fsec->fsec_magic != invert_magic) {
+ return;
+ }
+ /* acl_entrycount is byteswapped */
+ compare_acl_entrycount = ntohl(acl->acl_entrycount);
+ break;
+ case KAUTH_ENDIAN_DISK: /* not in disk, convert to disk */
+ if (fsec->fsec_magic != compare_magic) {
+ return;
+ }
+ break;
+ default: /* bad argument */
+ return;
+ }
+
+ /* We are go for conversion */
+ fsec->fsec_magic = ntohl(fsec->fsec_magic);
+ acl->acl_entrycount = ntohl(acl->acl_entrycount);
+ if (compare_acl_entrycount != KAUTH_FILESEC_NOACL) {
+ acl->acl_flags = ntohl(acl->acl_flags);
+
+ /* swap ACE rights and flags */
+ for (i = 0; i < compare_acl_entrycount; i++) {
+ acl->acl_ace[i].ace_flags = ntohl(acl->acl_ace[i].ace_flags);
+ acl->acl_ace[i].ace_rights = ntohl(acl->acl_ace[i].ace_rights);
+ }
+ }
+}
+
/*
* Allocate an ACL buffer.
kauth_acl_t
kauth_acl_alloc(int count)
{
- kauth_acl_t aclp;
-
+ kauth_acl_t aclp;
+
/* if the caller hasn't given us a valid size hint, assume the worst */
- if ((count < 0) || (count > KAUTH_ACL_MAX_ENTRIES))
- return(NULL);
+ if ((count < 0) || (count > KAUTH_ACL_MAX_ENTRIES)) {
+ return NULL;
+ }
MALLOC(aclp, kauth_acl_t, KAUTH_ACL_SIZE(count), M_KAUTH, M_WAITOK);
if (aclp != NULL) {
aclp->acl_entrycount = 0;
aclp->acl_flags = 0;
}
- return(aclp);
-}
+ return aclp;
+}
void
kauth_acl_free(kauth_acl_t aclp)
/*
* WARNING - caller must hold KAUTH_SCOPELOCK
*/
-static int kauth_add_callback_to_scope(kauth_scope_t sp, kauth_listener_t klp)
+static int
+kauth_add_callback_to_scope(kauth_scope_t sp, kauth_listener_t klp)
{
- int i;
+ int i;
for (i = 0; i < KAUTH_SCOPE_MAX_LISTENERS; i++) {
if (sp->ks_listeners[i].kll_listenerp == NULL) {
sp->ks_listeners[i].kll_idata = klp->kl_idata;
sp->ks_listeners[i].kll_listenerp = klp;
sp->ks_flags |= KS_F_HAS_LISTENERS;
- return(0);
+ return 0;
}
}
- return(ENOSPC);
+ return ENOSPC;
}
projects / apple / xnu.git / blobdiff